/* ==========================================================================
   Kirschner Gebäudeservice — Motion
   Ein Modul. Alles Bewegte läuft in gsap.matchMedia(): bei reduced motion
   bleibt nur Funktion (Slider, Menü, Umschalter), keine Choreografie.
   Jede Animation hat einen Zweck — Liste in DESIGN.md.
   ========================================================================== */
(() => {
  const root = document.documentElement;
  root.classList.add('motion-ready');

  const $ = (s, c = document) => c.querySelector(s);
  const $$ = (s, c = document) => [...c.querySelectorAll(s)];
  let lenis = null;

  /* ---------- Fakten, die sich selbst aktualisieren ---------- */
  const years = new Date().getFullYear() - 2003;
  $$('[data-years]').forEach((el) => { el.textContent = years; });
  $$('[data-year]').forEach((el) => { el.textContent = new Date().getFullYear(); });

  /* ---------- Header: fest nach 40px, weg beim Runterscrollen ---------- */
  const header = $('.site-header');
  const menuToggle = $('.menu-toggle');
  let lastY = scrollY;
  const onScroll = () => {
    const y = scrollY;
    if (header) {
      header.classList.toggle('is-solid', y > 40);
      const menuOpen = menuToggle && menuToggle.getAttribute('aria-expanded') === 'true';
      header.classList.toggle('is-hidden', !menuOpen && y > 480 && y > lastY + 2);
      if (y < lastY - 2) header.classList.remove('is-hidden');
    }
    lastY = y;
  };
  addEventListener('scroll', onScroll, { passive: true });
  onScroll();

  /* ---------- Mobiles Menü ---------- */
  const mnav = $('#mobile-nav');
  if (menuToggle && mnav) {
    mnav.inert = true;
    const setMenu = (open) => {
      menuToggle.setAttribute('aria-expanded', String(open));
      menuToggle.setAttribute('aria-label', open ? 'Menü schließen' : 'Menü öffnen');
      mnav.classList.toggle('is-open', open);
      mnav.inert = !open;
      document.body.style.overflow = open ? 'hidden' : '';
      if (lenis) open ? lenis.stop() : lenis.start();
      if (open && window.gsap && !matchMedia('(prefers-reduced-motion: reduce)').matches) {
        gsap.fromTo($$('.mobile-nav__link, .mobile-nav__meta', mnav),
          { yPercent: 60, opacity: 0 },
          { yPercent: 0, opacity: 1, duration: .8, ease: 'expo.out', stagger: .05, delay: .18 });
      }
      if (open) $('.mobile-nav__link', mnav)?.focus({ preventScroll: true });
    };
    menuToggle.addEventListener('click', () => setMenu(menuToggle.getAttribute('aria-expanded') !== 'true'));
    addEventListener('keydown', (e) => { if (e.key === 'Escape' && mnav.classList.contains('is-open')) { setMenu(false); menuToggle.focus(); } });
    $$('a', mnav).forEach((a) => a.addEventListener('click', () => setMenu(false)));
    matchMedia('(min-width: 1081px)').addEventListener('change', (e) => { if (e.matches) setMenu(false); });
  }

  /* ---------- Vorher/Nachher-Slider (Zeiger + Tastatur) ---------- */
  $$('.compare').forEach((cmp) => {
    let pos = 50;
    const set = (v) => {
      pos = Math.max(0, Math.min(100, v));
      cmp.style.setProperty('--pos', pos + '%');
      cmp.setAttribute('aria-valuenow', Math.round(pos));
      cmp.setAttribute('aria-valuetext', `${Math.round(pos)} % Vorher-Ansicht`);
    };
    const fromEvent = (e) => {
      const r = cmp.getBoundingClientRect();
      set(((e.clientX - r.left) / r.width) * 100);
    };
    let dragging = false;
    cmp.addEventListener('pointerdown', (e) => { dragging = true; cmp.setPointerCapture(e.pointerId); fromEvent(e); });
    cmp.addEventListener('pointermove', (e) => { if (dragging) fromEvent(e); });
    cmp.addEventListener('pointerup', () => { dragging = false; });
    cmp.addEventListener('pointercancel', () => { dragging = false; });
    cmp.addEventListener('keydown', (e) => {
      const step = e.shiftKey ? 10 : 2;
      const map = { ArrowLeft: pos - step, ArrowDown: pos - step, ArrowRight: pos + step, ArrowUp: pos + step, Home: 0, End: 100, PageDown: pos - 10, PageUp: pos + 10 };
      if (e.key in map) { e.preventDefault(); set(map[e.key]); }
    });
    set(50);
    cmp._set = set;
  });

  /* ---------- Notruf-Pille: nach dem Hero sichtbar, am Seitenende weg ---------- */
  const sos = $('.sos');
  if (sos) {
    const hero = $('.hero, .page-hero');
    const footer = $('.site-footer');
    let pastHero = false, atFooter = false;
    const update = () => sos.classList.toggle('is-visible', pastHero && !atFooter);
    if (hero) new IntersectionObserver(([e]) => { pastHero = !e.isIntersecting; update(); }, { rootMargin: '-20% 0px 0px 0px' }).observe(hero);
    if (footer) new IntersectionObserver(([e]) => { atFooter = e.isIntersecting; update(); }).observe(footer);
  }

  /* ======================================================================
     Ab hier: Choreografie. Ohne GSAP bleibt alles sichtbar und benutzbar.
     ====================================================================== */
  if (!window.gsap || !window.ScrollTrigger || !window.SplitText) {
    root.classList.remove('js', 'has-intro');
    return;
  }
  gsap.registerPlugin(ScrollTrigger, SplitText);
  gsap.defaults({ ease: 'expo.out', duration: 1 });

  const intro = $('.intro');

  /* Intro: zwei Chevrons + Wortmarke, dann Winkel-Wipe (nur 1× pro Session) */
  const playIntro = () => new Promise((resolve) => {
    if (!root.classList.contains('has-intro') || !intro) { resolve(); return; }
    try { sessionStorage.setItem('kk-intro', '1'); } catch (e) { /* privat */ }
    intro.style.animation = 'none';
    gsap.set(intro, { clipPath: 'polygon(0% 0%, 120% 0%, 100% 50%, 120% 100%, 0% 100%)' });
    const tl = gsap.timeline({
      onComplete: () => { root.classList.remove('has-intro'); resolve(); },
    });
    tl.from('.intro__mark .chev', { xPercent: 140, opacity: 0, duration: .5, stagger: .09 })
      .from('.intro__word span, .intro__word small', { yPercent: 115, duration: .5, stagger: .06 }, .15)
      .to(intro, { clipPath: 'polygon(0% 0%, 0% 0%, -20% 50%, 0% 100%, 0% 100%)', duration: .7, ease: 'expo.inOut' }, .75)
      .add(resolve, 1.0); /* Hero startet, während der Wipe noch läuft */
    intro.addEventListener('click', () => tl.progress(1), { once: true });
  });

  const splitLines = (el, vars = {}) => SplitText.create(el, {
    type: 'lines',
    mask: 'lines',
    linesClass: 'line',
    autoSplit: true,
    onSplit(self) {
      el.classList.add('is-split');
      return gsap.from(self.lines, { yPercent: 115, duration: 1.15, stagger: .09, ...vars });
    },
  });

  const mm = gsap.matchMedia();

  mm.add({
    motion: '(prefers-reduced-motion: no-preference)',
    desktop: '(min-width: 1024px)',
    fine: '(pointer: fine)',
  }, (ctx) => {
    const { motion, desktop, fine } = ctx.conditions;
    if (!motion) return;

    /* ---- Smooth-Scroll (Lenis), synchron mit ScrollTrigger; Touch bleibt nativ ---- */
    lenis = new Lenis({ lerp: .1, wheelMultiplier: 1, anchors: { offset: -90 } });
    lenis.on('scroll', ScrollTrigger.update);
    window.lenis = lenis; /* für Anker-Sprünge & Debugging */
    const raf = (t) => lenis.raf(t * 1000);
    gsap.ticker.add(raf);
    gsap.ticker.lagSmoothing(0);

    /* ---- Hero ---- */
    const hero = $('.hero, .page-hero');
    const heroH1 = hero && $('[data-split]', hero);
    const heroRest = hero ? $$('[data-hero]', hero) : [];
    const heroPaths = hero ? $$('.hero__chevrons path', hero) : [];
    gsap.set(heroRest, { opacity: 0, y: 24 });
    gsap.set(heroPaths, { strokeDasharray: 1, strokeDashoffset: 1 });

    const startHero = () => {
      if (heroH1) splitLines(heroH1, { delay: .05 });
      gsap.to(heroRest, { opacity: 1, y: 0, duration: 1.1, stagger: .08, delay: .35 });
      gsap.to(heroPaths, { strokeDashoffset: 0, duration: 1.8, ease: 'expo.inOut', stagger: .12, delay: .1 });
      const media = hero && $('.hero__media img', hero);
      if (media) gsap.from(media, { scale: 1.12, duration: 2.2, ease: 'expo.out' });
    };
    document.fonts.ready.then(playIntro).then(startHero);

    if (hero) {
      const chev = $('.hero__chevrons', hero);
      const media = $('.hero__media img', hero);
      const content = $('.hero__content, .page-hero__grid', hero);
      const st = { trigger: hero, start: 'top top', end: 'bottom top', scrub: true };
      if (chev) gsap.to(chev, { yPercent: -18, xPercent: 6, ease: 'none', scrollTrigger: st });
      if (media) gsap.to(media, { yPercent: 10, ease: 'none', scrollTrigger: { ...st } });
      if (content) gsap.to(content, { y: -60, opacity: .2, ease: 'none', scrollTrigger: { ...st, start: 'center center' } });
    }

    /* ---- Leistungen: horizontal gepinnt (Desktop) ---- */
    const hs = $('.hscroll');
    let hsTween = null;
    if (hs && desktop) {
      hs.classList.add('is-pinned');
      const track = $('.hscroll__track', hs);
      const bar = $('.hscroll__bar i', hs);
      const count = $('[data-hs-count]', hs);
      const panels = $$('.panel', hs);
      gsap.set(panels, { opacity: 1, y: 0 });
      const dist = () => Math.max(0, track.scrollWidth - innerWidth);
      hsTween = gsap.to(track, {
        x: () => -dist(),
        ease: 'none',
        scrollTrigger: {
          trigger: hs,
          start: 'top top',
          end: () => '+=' + dist(),
          pin: true,
          scrub: .8,
          invalidateOnRefresh: true,
          onUpdate: (self) => {
            if (bar) bar.style.transform = `scaleX(${self.progress})`;
            if (count) count.textContent = String(Math.min(panels.length, Math.floor(self.progress * panels.length) + 1)).padStart(2, '0');
          },
        },
      });
      panels.forEach((p) => {
        const img = $('img', p);
        if (img) gsap.fromTo(img, { xPercent: -6, scale: 1.18 }, {
          xPercent: 6, scale: 1.18, ease: 'none',
          scrollTrigger: { trigger: p, containerAnimation: hsTween, start: 'left right', end: 'right left', scrub: true },
        });
      });
    }

    /* ---- Textzeilen aus der Maske ---- */
    $$('[data-split]').forEach((el) => {
      if (hero && hero.contains(el)) return;
      splitLines(el, { scrollTrigger: { trigger: el, start: 'top 86%', once: true } });
    });

    /* ---- Blöcke gestaffelt einblenden ---- */
    const reveals = $$('[data-reveal]').filter((el) => !(hs && desktop && hs.contains(el)));
    ScrollTrigger.batch(reveals, {
      start: 'top 88%',
      once: true,
      onEnter: (batch) => gsap.to(batch, { opacity: 1, y: 0, duration: 1, stagger: .08, overwrite: true }),
    });

    /* ---- Winkel-Reveal für Bilder (Signatur) ---- */
    $$('.reveal-img').forEach((el) => {
      const img = $('img', el);
      const tl = gsap.timeline({ scrollTrigger: { trigger: el, start: 'top 82%', once: true } });
      tl.to(el, { '--x': '0%', duration: 1.35, ease: 'expo.inOut' });
      if (img) tl.from(img, { scale: 1.18, duration: 1.8, ease: 'expo.out' }, 0);
    });

    /* ---- Philosophie: Wort für Wort hell (gescrubbt) ---- */
    $$('[data-scrub-words]').forEach((el) => {
      SplitText.create(el, {
        type: 'words',
        wordsClass: 'word',
        autoSplit: true,
        onSplit(self) {
          return gsap.fromTo(self.words, { opacity: .14 }, {
            opacity: 1, ease: 'none', stagger: .12,
            scrollTrigger: { trigger: el, start: 'top 78%', end: 'bottom 42%', scrub: true },
          });
        },
      });
    });

    /* ---- Timeline-Linie zeichnet sich ---- */
    $$('.timeline').forEach((tl) => {
      const line = $('.timeline__line i', tl);
      if (line) gsap.fromTo(line, { scaleY: 0 }, {
        scaleY: 1, ease: 'none',
        scrollTrigger: { trigger: tl, start: 'top 70%', end: 'bottom 65%', scrub: true },
      });
    });

    /* ---- Philosophie: Hintergrundbild läuft langsamer mit ---- */
    $$('.philosophy__media picture').forEach((el) => {
      gsap.fromTo(el, { yPercent: -8 }, {
        yPercent: 8, ease: 'none',
        scrollTrigger: { trigger: el.closest('section'), start: 'top bottom', end: 'bottom top', scrub: true },
      });
    });

    /* ---- Parallax für einzelne Elemente ---- */
    $$('[data-parallax]').forEach((el) => {
      const amt = Number(el.dataset.parallax) || 10;
      gsap.fromTo(el, { yPercent: -amt }, {
        yPercent: amt, ease: 'none',
        scrollTrigger: { trigger: el.parentElement, start: 'top bottom', end: 'bottom top', scrub: true },
      });
    });

    /* ---- Vorher/Nachher: einmal kurz zeigen, dass man ziehen kann ---- */
    $$('.compare').forEach((cmp) => {
      const o = { v: 50 };
      gsap.timeline({ scrollTrigger: { trigger: cmp, start: 'top 70%', once: true } })
        .to(o, { v: 72, duration: .9, ease: 'expo.inOut', onUpdate: () => cmp._set(o.v) })
        .to(o, { v: 50, duration: .9, ease: 'expo.inOut', onUpdate: () => cmp._set(o.v) });
    });

    /* ---- Magnet-Buttons (nur Maus) ---- */
    if (fine) {
      $$('.btn, [data-magnetic]').forEach((btn) => {
        const xTo = gsap.quickTo(btn, 'x', { duration: .6, ease: 'expo.out' });
        const yTo = gsap.quickTo(btn, 'y', { duration: .6, ease: 'expo.out' });
        const clamp = gsap.utils.clamp(-6, 6);
        const move = (e) => {
          const r = btn.getBoundingClientRect();
          xTo(clamp((e.clientX - r.left - r.width / 2) * .18));
          yTo(clamp((e.clientY - r.top - r.height / 2) * .3));
        };
        const leave = () => { xTo(0); yTo(0); };
        btn.addEventListener('pointermove', move);
        btn.addEventListener('pointerleave', leave);
        ctx.add(() => () => { btn.removeEventListener('pointermove', move); btn.removeEventListener('pointerleave', leave); });
      });
    }

    /* Nach Font-Load und Bildern Layout neu messen */
    document.fonts.ready.then(() => ScrollTrigger.refresh());
    addEventListener('load', () => ScrollTrigger.refresh(), { once: true });

    return () => {
      gsap.ticker.remove(raf);
      lenis?.destroy();
      lenis = null;
      hs?.classList.remove('is-pinned');
    };
  });

  /* Reduced motion: Intro nie zeigen, Zähler stehen schon auf Endwert (HTML) */
  mm.add('(prefers-reduced-motion: reduce)', () => {
    root.classList.remove('has-intro');
  });
})();